OpenID Connect function is incompatible with Azure AD

[ctt828]

1. I can get OpenID connect authentication working with Auth0.

2. The Elasticsearch node complains when I try to login with Azure AD :

odfe-node1 | [2019-04-25T08:18:16,011][WARN ][o.a.c.r.s.j.j.JwsUtils ] [o_v6jg5] No signature algorithm was defined

3. I get a copy of the OIDC discovery documents from Microsoft, manually add "alg":"RS256" to the JWKS document and host these metadata documents on my own server. Then I can finally login with Azure AD.

4. According to the discussion here, "alg" should be optional, please fix this.

[ctt828]

Sorry, didn't notice that this issue has been addressed by others ;
https://discuss.opendistrocommunity.dev/t/oidc-with-azure-ad-algorithm-not-set/470
opendistro-for-elasticsearch/deprecated-security-advanced-modules#11